Possible Shadow Credentials Added
Detects possible addition of shadow credentials to an active directory object.
Convert In Phoenix Studio
Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.
Definition
The "Audit Directory Service Changes" logging policy must be configured in order to receive events. Audit events are generated only for objects with configured system access control lists (SACLs). Audit events are generated only for objects with configured system access control lists (SACLs) and only when accessed in a manner that matches their SACL settings. This policy covers the following events ids - 5136, 5137, 5138, 5139, 5141. Note that the default policy does not cover User objects. For that a custom AuditRule need to be setup (See https://github.com/OTRF/Set-AuditRule)
detection:
selection:
EventID: 5136
AttributeLDAPDisplayName: 'msDS-KeyCredentialLink'
# If you experience a lot of FP you could uncomment the selection below
# There could be other cases for other tooling add them accordingly
# AttributeValue|contains: 'B:828'
# OperationType: '%%14674' # Value Added
# As stated in the FP sections it's better to filter out the expected accounts that perform this operation to tighten the logic
# Uncomment the filter below and add the account name (or any other specific field) accordingly
# Don't forget to add it to the condition section below
# filter:
# SubjectUserName: "%name%"
condition: selectionModifications in the msDS-KeyCredentialLink attribute can be done legitimately by the Azure AD Connect synchronization account or the ADFS service account. These accounts can be added as Exceptions. (From elastic FP section)